jpeg参考文献

JPEG File Interchange Format File Format Summary
http://www.fileformat.info/format/jpeg/

Decoding the file JPEG format
http://www.codeproject.com/bitmap/iptc.asp

4.1 JPEG标准 相关文件
http://www.w3.org/Graphics/JPEG/itu-t81.pdf
http://www.w3.org/Graphics/JPEG/jfif3.pdf
http://www.jpeg.org/public/jfif.pdf

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